Marcou.] 
220 
[Jan. 21 
know if there was any peculiar geological fact at Wolfe’s cove 
and Wolfe’s field, in explanation of the choosing of that special 
locality of the north shore of the St. Lawrence river for disem- 
barking the British army. After looking carefully, I did not see 
any fault, or any change in the lithological character of the slates. 
Denudation and erosion were the only factors in allowing a more 
easy ascent of the cliff at that place. Lately Dr. Ells in his Re- 
port ( Loc . cit. p. 44 K) says that he found “a profound fault,” a 
new term, never used in geology before, and which is not ex- 
plained. 
In 1861, ’62 and ’63, I finished my first sketch of 1849 ; and if 
I did not publish sooner my notes with geological map and sec- 
tions, it was because I thought that after the publication of my 
letter to Barrande in 1862, and my paper on Pointe-Levis in 
1864, I had given sufficient explanations of the geology of the en- 
virons of Quebec, and a classification of strata so clear and well 
justified by plain facts in the field that it was almost useless to 
go any farther on my part, leaving the field to local geologists 
and the geological survey of Canada. But the publication of the 
Report of Dr. Ells in 1890, and his paper of April 1890, in the 
Bulletin Geol. Soc. America , vol. i, pp. 453-468, with a geo- 
logical map of the vicinity of Quebec, present the geology of the 
region in such a shape, and with such classification and dynamic 
phenomenon of great faults, entirely different from the result 
arrived at by my researches, that I am justified in publishing my 
observations at this late date, so many years after making them. 
The only additions made to my map are due to discoveries of 
Utica fossils, on the edge of the St. Lawrence river at the mouth 
of Montmorency river, and at two places near Charlebourg’s 
church, by the geological survey of Canada. I have marked by 
a cross the places where Taconic fossils have been found, always 
in a sporadic condition, by both the geological survey of Canada 
and myself. 
Finally I must say, that the outcrops of the diabasic flows and 
eruptions among the slates of the Middle Taconic, in the Etchemin 
and Chaudiere rivers area, were not surveyed carefully and want 
to be looked a-new on a map of large scale. On my map they 
must be taken as an expression of a general fact existing in that 
area, and not as mathematically exact, as regards precision in 
their location. 
